Saw-swaging machine



(No Model.) I v C. CAMPBELL.-

` SAW SWAGING MAGHINBK No. 355,379. l .Patented Jan. 4, 1887.

UNITED STATES COLLIN CWOOD CAMPBELL, OF VEST BAY CITY, ASSIGNOR CF CNE-HALF PATENT TO JAMES E. THOMAS, OF'BAY CITY, MICHIGAN.

SAW-SWAGING MACHINE.

SPECEFICATION forming part. of Letters Patent No. 355,379, dated January 4, 1867.

l Application filed July 31, 1886. Serial No. 209.608. (No model.)

To all whom it may concern:

Be it known that I, CoLLINewooD CAMP- BELL, a citizen of the United States, residing at \Vest Bay City, in the county of Bay and State of Michigan, have invented certain new and useful Improvements in Saw-Swagiug Machines, of which the following is a specification, reference being had therein to the accompanying drawings. y A

This invention relates to improvements in Asaw-swaging machines of that class which are clamped to a saw-tooth and provided with a die and anvil which operate to spread the point of the saw-tooth in lateral directions and form a cutting -edge which is wider than the thickness of the saw, and which operates when cutting to form a saw-hert' of sufcient width to give the proper clearance to thesaw.

The invention consists, chiefly, in the combination and arrangement of a suitable holder and devices for securing the holder to the saw, a cylinder passing through the holder and provided with a longitudinal opening carrying a cylindrical die and anvil inclosed iu the holder, and devices for adjusting the anvil to the die; and the object ot' my invention is to provide a machine for swaging the teeth of saws which will operate with great ease, and that will spread the cutting-face of the saw-tooth in a manner to reduce lthe liability of breaking the edges thereof, and that will form av more perfect cutting-point upon the tooth `by operating upon the tooth in a manner to roll out the material thereof, instead of spreadingthe point of the tooth by direct pressure. tain these objects are illustrated in the accompanying drawings.

Figure l is a side view'of my improved device. Fig. 2 is a view of the opposite side of the same. Fig. 3 is a vertical section of Fig. 1. Fig. 4 is a section of Fig. 3 through m x. Fig. 5 is a section through y y. Figs. 6 and 7 are views of the cylindrical die-holder detached. Fig. 8 is an enlarged view of the die detached.

a represents a holder of circular form, for convenience, the lower portion of which is provided with a slot, b, formed transversely with the diameter' of the holder, and forming The devices which I employ to at! portion reaching to the side faces of the holderl "a, and with the portions j projecting beyond the side faces of the holder; and one or more levers lc are firmly secured to the portions j, and, extending beyond the outer edge of the holder, are bent inwardly and form a single arm, Z. 4'

The portion of the cylinder passing through the slot d when the cylinder is in position in the holder a is cut away, forming a slot, m, and leaving a portion, u, about one-third of the size of the cylinder solid; and a longitudinal opening, o, isfformed in the die-holder or cylinder, and is located a short distance on one side of the center of the cylinder and passes through the slot m, and is about onehalf its diameter into the solid portion n. A cylindrical die, p, is placed'into this opening o, and is of a proper length to reach for a short distance on each side ot' the slot m, leaving a die-face, h, exposed in the slot, and is held loosely in position by a screw, q, passedinto the outer end of theopening lo. This opening o may extend entirely through the die-holder, if required, and a screw, q', is then placed in the opposite end of the opening. These screws loosely secure the die in place and allow a longitudinal adjustment or" the die p, so that the portion of the die exposed by the slot m and forming a die-face, h, may be changed by moving the die slightly endwisc. A radial opening, c', is formed through the upper portion ofthe holder a,`and extends entirely into the slot b in a line diagonal to the upper portion of the slot, and an anvildie, u, having adie-face, c, diagonal with its body, is placed within the opening e', and the lower portion, f', is cut away on its sides to a proper size to allow it to pass 'within the slot m, and its upper portion is provided with a spindle, g', and surrounding the spindle g' is 10o a sleeve, h', which is provided on its outer surface with a screw-thread and is passed into the opening e', the opening c being provided with ascrew-thread. The die u reaches into the slot gn, and the screw-threaded sleeve then holds the die in position and allows the dieface to be adjusted to a proper position in relation to the die p.

When the die u is properly adj usted, the block a is placed upon the saw with the sawtooth resting within the slot b, and with the back or upper edge of the tooth to be operated upon resting against the die-face o, and with its front or cutting edge resting against the face h of the die p. The clamping-screws c and e are then adjusted to firmly hold the tooth in position, and then the levers k are operated to rotate the dieholder t' in the direction indicated by the arrows, and the die p, being located onv one side of the center of the holder i, engages with the saw-tooth considerably below its point, and as the holder is revolved the die rolls toward the point of the tooth, and at the same time presses into the tooth, forming arecess into the tooth and spreading out laterally the point or cuttingportion of the tooth to a width considerably greater than the thick ness of thesaw-plate. The points of the teeth are then slightly dressed and fitted up with a file, and the saw has a free and easy clearance in the log.

The advantage of this form of dieholder is, that the die, being held loosely in position in ,the holder, is allowed to revolve as the die moves toward the point of the tooth, which has the effect of reducing the friction, and also leaves the metal in the point of the tooth in better condition, as the original temper of the steel is retained, and it also forms a different impression-tooth from an ordinary swagingdie, beginning farther from the point and moving forward, forming a deeper impression as it nears the point, and leaves the tooth longer than before the swaging operation was performed.

The die l? may be formed with an even or straight cylindrical surface, or have an irregular face, as shown in Figs. 4., 8, and 7. 4 is shown the die-face formed with two reduced portions, r, on the outer portions of the die-face, and with the reduced part s located centrally between the portions 'r. This construction forms the heavier portions t between the portions r and s, which operate to spread the sides of the saw-tooth by making a heavier impression upon each side of the center of the saw-tooth, and leaves a fuller portion in central part of the die-impression, whiclroperates to prevent splitting the tooth by the swaging operation.

In some cases-as with Vthin sawsthe central depression, s, may be left out, as shown in Fig. 7, and produce a better result, vas the material will be sufficiently spread with a lighter impression upon the tooth.

Around the holder a is a band, fi', one end of which is bent outward and forms an arm,

In Fig.

j', and the other end, k', reaches outward upon the arm j for a short distance, and is secured thereto by a bolt, l', a small space being left between the part k and the arm'j, which allows the bolt Z to draw the parts together and clasp the band i firmly around the holder, 'so that the extended arm j may be secured in any desired position.- The outer end of this arm j is provided with a portion, m', extending from its side, which bears upon the point of a tooth which has been swaged, and operates` to bring thc holder to the'saine position on every tooth.

I do not confine my inventiouentircly to `lindrical die placed in the said longitudinal opening and extending across the said slot, substantially as and for the purpose set forth. l 2. In a saw-swage, a cylindrical revolving die having a die-face extending entirely around its central portion, and consisting of the reduced portions r on each end portion of the face and the reduced portion s iu the centralv portion of the face, substantially as and for the purpose set forth. v

3. In a saw-swage, the combination, with a holder, c, provided with devices for clamping the holder to the saw, and an anvil-die supported by the holder, of 'a cylindrical dieholder passed through the holder a and provided witha longitudinal opening in one side of its center, and having a transverse slot in the middle of its length and reaching into the said longitudinal opening, and a cylindrical die placed into the said opening and extending across the slot, substantially as and for the purpose set forth.

4. In a saw-swag'e, the combination, with a cylindrical die-holder having a longitudinal opening on one side of its center and a transverse slot in the middle o f its length and reaching to the said opening, and a cylindrical die within the opening and extending across the slot, of a screw passed into the end of the said longitudinal opening and with its inner end against the die, substantially as and for the purpose set forth.

5. In a saw-swage, the combination, with a cylindrical die-holder provided with atransverse slot in the middle of its length and a longitudinal opening in one side of its center, and a cylindrical die within the opening, of an anvil-die having a portion reaching -into the said slot and provided with a die-face, substantially as and for the purpose herein set forth.

6. In a saw-swage, the combination, with IOO IIO

holder ,providedwith devicesfor clamping the holder to the saw-tooth, and a cylindrical dieholder provided with a cylindrical die on one' side of its center and a transverse slot on one side of the cylinder opening to the diefaee, of an anvil-de, u, having aportion,f, eXtending into the said slot and provided with a diefaee, aspindle, g', extending through the upper portion of the holder a, and a sleeve, h, surrounding the spindle and secured to the holder a by a screw-thread, substantially as and for the purpose setforth.

7. In a saW-swage, a cylindrical dieholder having a longitudinal opening in one side of its center and a transverse slot in the middle of its length and reaching to the opening, in combination withsa cylindrical die reaching across the slot and loosely secured within the said opening, whereby the die revolves in one direction and the holder in the opposite direotion when operating on the saw-tooth, substantially as set forth.

8. In a saw-swage, the combination, with a holder, a, and devices for clamping the holder to the saw, and a die-holder passing through the holder a and provided with a cylindrical die, of a band, i', surrounding the holder and provided with the arm j land the extension k', and the bolt l', passed through the arnl and extension, substantially as herein set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

` COLLINGWOOD CAMPBELL Witnesses:

FRANK LUCAS, CHARLES J. LooKER. 

